Cutting attachment for sewing machines



J. W. SCHILLER.

CUTTING ATTACHMENT FOR SEWING MACHINES.

APPLICATION FILED OCT. 17, 1918.

1 ,409, 121 Patented Mar. 7, 1922.

1 JlY/fllz" (7536,1972 711 5670212677 UNITED STATES JOSEPH W. SCHILLER, OF ST. LOUIS, MISSOURI.

CUTTING ATTACHMENT FOR SEWING MACHINES.

Application filed October 17, 1918.

To all whom it may concern Be it known that I, JOSEPH IV. SCHILLER, a citizen of the United States, and resident of St. Louis, Missouri, have invented certain new and useful Improvements in a Cutting Attachment for Sewing Machines, of which the following is a specification.

This invention relates to an improvement in cutting attachments for sewing machines, and has for its chief object the provision of a rotatable cutter located on the machine table in close proximity with the needle and adapted for operation simultaneously with the operationof the sewing machine so as to trim the edge of the fabric as it passes through the machine.

A further object of my invention is to arrangesuch a cutter to operate with the movement of the fabric and to temporarily remain'stationary during the time that the needle is passing through the fabric making the stitch, andto rotate and trim the edge of the fabric during each forward movement of each stitch.

With the above and other objects in view, my invention resides in the novel features of form, construction, arrangement, and combination of parts hereinafter described and afterwards pointed out in the claim.

My cutting attachment is simple in con struction and is mounted on a plate which is inserted in the machine table, and can be readily and easily removed from its position when it is desired to use the machine on such work where cutting is not required.

In the accompanying drawing,

Figure l is a side elevation of a portion of a sewing machine equipped with a cutting attachment embodying my invention.

Fig. 2 is a detail side elevation of the attaohment.

Fig. 3' is a front view of the same.

Fig. at is a cross-sectional view taken on the line 44 of Fig. 2, and

Fig. 5 is a bottom plan view.

In the construction of my invention I provide a plate 8, which is of a length suflicient to support a bearing block 9 which is held on the plate by the cap screws 10. In this bearing block 9 is supported a short shaft 11, on the rear end of which is located a gear wheel 12, and on the front end a cutter 13. This cutter is of circular form and may be a straight cutting disc or its surface may be zig-zag as that indicated by the numeral Specification of Letters Patent.

Patented Mar. 7, 1922. serial No. 258,511.

14:, which causes a toothed effect in the trimmed edge of the fabric.

Beneath the machine table 15 is located a bracket 16 in which is supported the shuttle driving shaft 17. On the front end of the shaft 17 is mounted a shuttle drum 18 whose outer periphery l9 acts as a support for the fabric as it passes between the same and the cutter disc 13.

On the shaft 17 is also loosely mounted a gear wheel 20 and connected to the same by means of screws or pins 21 is a ratchet wheel 22. Disposed around the periphery of the ratchet wheel 2lfis a ring 23 upon which is mounted a spring-pressed ratchet pawl 24 adapted for engagement with the ratchet 22 for operating the same when the ring is partially rotated.

his partial rotation or reciprocatory shifting of the ring is accomplished by a rocking arm 25, which is connected at one end to a rocking shaft 26. To the free end of the rocking arm 25 is attached a connecting link 27, which is also connected to an ear 28 formed on the ring 23. By the rocking motion of the shaft, the lever mechanism' and ring 23 are rotated backward and forward, bringing the pawl 24 in contact with the ratchet 22 rotatably actuating it in one direction and simultaneously actuating with it the gear wheel 20 which rotates the gear wheel 12 and cutter l3.

In order to hold the cutter in position during the return idle movement of the rocking mechanism, I place in the bearing block 9 a spring-controlled latch.29. This is arranged to have its tooth in contact with the ratchet teeth to hold the same from turning back during the shifting movement of the ring 23. The ring is provided with an elongated slot 30 which allows for the proper shifting movement of the ring. The essential feature of my invention is to provide a machine with a rotating cutter which will work in conjunction with the stitching mechanism of the machine and simultaneously trim the edge of the cloth during the sewing process.

I am aware that minor changes in the form, construction, arrangement, and combination of the. several parts of my new cutting attachment may be made and substituted for those herein shown and described without departing from the nature and principle of my invention.

Having fully described my invention what I claim is:

A cuttingattachment for sewing machines comprising, in combination, a block adapted forlocatio'n on the machine-table, a shaft mounted for rotation on the block, a cutting disk fixed to the shaft, and means for intermittently driving the shaft for actuating the cutter rotatably for trimming the cloth during advancing movement of the same, said means including a first gear fixed on the shaft, a second gear having meshing engagement with the first gear, a ratchet wheel conjoined to the second gear, a slotted ring mounted for shiftable movement about 7 the ratchet wheel, a spring-pressed pawl carried by the ring for driving engagement with the teeth of the ratchet wheel, a rocking lever mechanism having engagement with the ring for reciprocatorily shifting the 

